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Hi there,
You will need to contact any Mercedes Benz Service center with your VIN from the vehicle. They may also need you to provide evidence of your ownership for the vehicle. This is a standard precaution associated with security codes. Only the owner of the vehicle is allowed the information. They will give you the code from records kept against the vehicle.
regards
robotek

That's a common thing with newer vehicles. The alarms, interior lights, and other things are integrated through the factory stereo system. Most of the time, you can buy a wiring harness that accommodates these things, but they are not $20 bucks like at Wal-Mart, and do get expensive. Sorry about the bad news, hope this helps. Good luck!

sounds to be a drain of sorts. Do you have a good ground to the radio? If so the radio may be sticking open in the switch circuit and blows the relay buzz fuse and then after the power is removed the ciruit resets itself. If this is the case there is a dead short inside the radio

My initial thought is the alarm somehow drained the battery down so low that there's not enough power to even turn on the LED or start the car. If that's the case, getting a jump from another vehicle should at least let you disarm the alarm and start the car.

Beyond that, you'll probably need to reference the manual for your model alarm. You can find the manuals here.